Coiled tube steam boiler



. Aug. 20, 1935. K. BAUMANN COILED TUBE STEAM BOILER Filed OO t. 11, 1934 3 Sheets-Sheet 1 Inventor;

his attorneys.

Aug. 20, 1935. K. BAUMANN COILED TUBE STEAM BOILER Filed Oct. 11, 1934 3 Sheets-Sheet 2 I InVntor;

I Karl Baumann,

his attorneys.

3 K. BAUMANN 2,012,216

COILED TUBE STEAM BOILER Filed-Oct 11, 1954 s Sheets-Sheet s Inventor;

Karl Baumann, 1 By 144 4 his attorneys.

" and erect and also to dismantle for inspection Patented Aug. 20, 1935 I I I v fl entrees mes want;

v P I N T b I?ICE1 ibia-ms. '(ol. 122 250) The invention relatesftosteam-boilers of the forced circulation typesuchas those known; as the once-through, the-Benson, the multiple superheater? and suchliketypes, and hasa par-1 ticular, althoughfby no means exclusivefapplica tion toboilers of this type whichemploy pressure combustion,

Themain object of the inventionis to provide an improved construction of steam andwater tube for such boilers, and mounti means therefor; which parts are relatively simple to manufacture and replacementpurposes; Another object is to provide tubes which may be incorporated in a new andimproved form of generator which isparticularly suitable for the regeneration of hignpressure steam at high temperatures.

Although the inventionis herein described as applied to a steam boiler or generator, it is to be understood that the boiler or generator accordingto the present invention may be employed for the evaporation of liquids of diiferent'kinds, and such will be included within the scope of the claims.

In order that the invention may be more clearly f understood, reference will now be made to the accompanying drawings, wherein:

Figure 1 shows diagrammatically a vertical section of a preferred form of steam boiler embodying the invention.

Fig-2 showsa vertical section of a casing struc ture' for certain types of coils.

Fig. 3 is a horizontal section on the line III-.III of Figs. 1 and 2.' p

Figs. {and 5 respectively show ways of connecting adjacent turns of a coil.

Figures 6 and 7 show arrangements for employ ing several coils concentrically disposed.

Fig. 8 is a section through VITIVIII of Fig. 1.

Fig. 9 shows diagrammatically a vertical section of a modified form of boiler, and

" Fig. 19 shows a manner of leading the coil ends through the boiler wall in the arrangement shown in Fig. 9. p

In the arrangement shown in Fig. .1, A indicates a gas or oil burner, B the combustion chamber,

whilst C, D, and E respectively indicate succes sive sections of the boiler which stitute separate units. 1

1 The reference I indicates the coils, and 2 the coil ends.

preferably con- Each 'coil is formed of a tube closely wound back upon itself so that both ends are disposed at one end of the coil and the return bend of the tube is located at the other end of the coil.

are passed;

A steam generator "may be constructed as}.

s'embling a plurality of v said coilscoaxially' in, alinementfvertically or horizontally, the outlet? endof the tube comprising one coil beingclon nected to the inlet end of the tubecomprising the next coil. Any desirednumberof individual sections each containing a coil of the' type above describedmay, beassernbled together, each coil being encased within a flanged metal shell. Dig tance pieces are provided between, the abutting flanges of adjacent metal shells through which the inlet "ends of the tubes comprising the coils.

" As shown in'the drawings, the coils in the sections B, C and D line the walls of the sections and are exposed to the furnace heating on the internal side only, whilst the tubes in the section v E are exposed to heating on both sides. Aconvenient construction of section for the former case is shown in Figures 2 and 3 in which the wall 3 of the section is provided with a lining l of heat insulating material.

cient clearance should be providedbetween the I coil and the casing to permit the coil to unwind under the influenceof the heating. Prefer-ably a metal shield 5 is interposed between the coil and the casing to prevent wear; of the latter when I the coil unwinds.

.By anchoring each coil at the end at which-the inlet and outlet ends of the pipe are located and leaving the other'end free the coils may be left free to expand in an'axial direction; at the same time there will of course tend to be a certain amount of unwinding and increase of diameter.

In Fig. 3the distance piece 6 between the flanges 3d of adjacent sections '3 is shown as formed of two parts secured together by bolts 7 y,

and the coil ends 2 pass through the parts so that the coil is'supported at these points. a

The unwinding of the coils due to heating may be prevented to a large extent and their stability increased by welding adjacent turns of the coil together as indicated by the reference 8 in Fig.

4. The welding may extend only over part of the lengthof the coil or it may extend over the entire length and thus also provide a seal against leakage of flue gases between the turns of the coils. Alternatively, as indicated by therefer ence 9 in Fig. 5, a metal wire maybe wound around the coil between successive turns, the wire being welded on either side to the turns.

. r In many cases it may be desirable to employ :two or more coils arranged. concentrically as shown in'Fig. 6 in which figure the inner coil is, shown arranged on a Single cylindrical surface or, alternatively, the downgoing half of the V inner tube may be arranged on a'different cylindrical surface concentric with the upgoing half and either inside it or outside it so as to form a double wound coil as indicated in Fig. 7.

Figure 8 shows in plan View an arrangement of a distance piece suitable in such a case according to which the distance piece is formed of four members bolted together in the form of a rectangle. v J

Figure 9 shows an arrangement in which concentrically arranged coils connected in series are employed, the turns of the coil in section-B being wound closely together so as to co-operate with a refractory bafile It to cause the flue gases to follow a tortuous passage as indicated by the arrows. In the sections C and D the gases are further guided by the baflles ll, [2, and l3. In such cases the pipe ends may conveniently pass outward through distance. pieces comprised of a number of short metal pieces 54 (Fig. 10) suit.- ably bent so that their ends may be secured together as by bolts 1 to constitute a substantially circular or polysided annular member which may be accommodated between the abutting flanged ends of the adjacent section walls.

The arrangement employed enables any of th coils to be' easily withdrawnfrorn the shell of a section. Further the arrangement is particularly suited for highsteam pressure.

It will be appreciated that where a number of coils are employed, as for instance in the above arrangement, some of the coils may constitute economizer units whilst others may constitute superheater units.

I claim:

1. In a steam generator of the kind described, fluid tubing arranged in a double coil, end portions to said tubing located at one end of said coil and a return bend located at the other end thereof, walling surrounding said tubing, said walling being divided into sections, a distance piece between a pair of adjacent sections, and means whereby said coil ends are anchored to said distance piece to support said coil.

2. In a steam generator of the kind described, fluid tubing arranged ina multiple coil, end portions to said coil and means for anchoring said tube end portions to support said'coil, walling surrounding said coil a layer of heat insulating material to said walling and a metallic shield to said walling arranged to protect said walling against damage by said tubing.

3. In a steam generator of the kind described .a plurality of concentrically arranged coils of 

